As one of its daily deals, Amazon offers Prime members the EarthEasy LifeStraw Family 1.0 Water Filter, model no. LSF101402, for $44.99 with free shipping. (Non-Prime members can spend $49 or more to qualify for free shipping; otherwise, shipping adds $5.58.) That's $6 under our July mention and the lowest total price we've seen. (It's a current low by $30.) It filters and purifies up to 18,000 liters of water, enough to supply clean drinking water for a family of five for up to three years. Deal ends today.